Considerable efforts have been devoted to the investigation of rare earth ion doped fibers owing to their wide-ranging applications in optical communication,medicine,astrophysics,and other domains.However,the gain bandwidth of rare earth doped fiber is limited to ～80 nm due to the narrow f-f transition between 4f orbits of rare earth ions.It is seen that there is no effective rare earth doped fiber lasers in the region of 1150-1500 nm,but this spectral region is very promising for many important applications.Fortunately,in 2001,Fujimoto et al.reported the NIR emission centered at 1.3 μm with the full width at half maximum (FWHM) larger than 200 nm from bismuthdoped silica glasses,[1] and then they demonstrated optical amplification at 1300 nm in 2003.[2] Those results show a possibility for the development of fiber lasers and amplifiers in this spectral region.Since then,a huge number of bismuth doped glass hosts have bccn explored,mainly including silicate,germinate,phosphate,borate,and chalcogenide glasses.[3-13] The first bismuth doped optical fiber was fabricated in 2005 using the MCVD technique.[14,15] In recent years,various bismuth doped fibers and its lasers have been researched.[16] For example,Wang et al.[17] reported NIR emission in a wide region of 1000 1700 nm in bismuth doped double-cladding fibers.Bismuth doped broadband NIR emission materials have drawn much attention for their potential applications in optical fiber lasers and amplifiers.